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Fix sorting of NULL values (Should always be first)

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Fix problem with HAVING and MAX() IS NOT NULL
This commit is contained in:
monty@tik.mysql.fi
2002-03-02 09:51:24 +02:00
parent c639329afb
commit 9d9bcf25e7
13 changed files with 144 additions and 36 deletions
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3
sql/opt_range.h
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@ -77,6 +77,7 @@ public:
void reset(void) { next=0; it.rewind(); }
int init() { return error=file->index_init(index); }
virtual int get_next();
virtual bool reverse_sorted() { return 0; }
int cmp_next(QUICK_RANGE *range);
bool unique_key_range();
};
@ -87,6 +88,7 @@ class QUICK_SELECT_DESC: public QUICK_SELECT
public:
QUICK_SELECT_DESC(QUICK_SELECT *q, uint used_key_parts);
int get_next();
bool reverse_sorted() { return 1; }
private:
int cmp_prev(QUICK_RANGE *range);
bool range_reads_after_key(QUICK_RANGE *range);
@ -96,6 +98,7 @@ private:
List_iterator<QUICK_RANGE> rev_it;
};
class SQL_SELECT :public Sql_alloc {
public:
QUICK_SELECT *quick; // If quick-select used